During November 2025, Zafar focused on enhancing data processing performance in the mathworks/arrow repository by optimizing Parquet write operations. He increased the chunk_size parameter to 64KB in the C++ codebase, which improved throughput and reduced write latency for large payloads. This adjustment addressed bottlenecks in data ingestion pipelines, resulting in more predictable performance for downstream analytics workflows. Zafar updated documentation to clarify recommended chunk_size values and implemented comprehensive tests to validate the new behavior. His work demonstrated a strong grasp of C++, data processing, and performance optimization, delivering a targeted solution to improve Parquet workload efficiency without altering the user-facing API.